The ideal seismic isolation device for electric cabinets should be locked under external excitation that does not affect the safety of the structure,. When the device is subjected to earthquakes exceeding the structural fortification intensity, it is quickly unlocked to give full play to its seismic isolation capabilities.The acceleration trigger mechanism can switch the state switching between unlock and lock according to the ground motion acceleration.Therefore, it is an effective method to add an acceleration trigger mechanism to the seismic isolation device. In order to study the impact of acceleration trigger mechanism on the isolation performance of electric cabinets, a electric cabinet was selected as research object. A model of seismic isolation trigger electric cabinet was established through finite element software, and seismic time history analysis was performed to compare the isolation efficiency. Results show that: 1) The reasonable trigger limit of the acceleration trigger mechanism should be selected as 0.1g; 2) The isolation trigger cabinet’s maximal acceleration response and seismic isolation rate are almost same as the isolation cabinet. The effect on the seismic isolation performance is minimal. This shows that the seismic isolation device with acceleration trigger mechanism, can be used as an ideal seismic isolation device for electric cabinets.